I have a Custom Shop made JB/59 hybrid (the one in the Trading Post), along with a matching '59/Jazz neck, both taken from a $5K ESP Exhibition series guitar, but I never got around to trying them myself. I'm on a major downsizing spree at the moment, as I am moving states at the end of the year. So, I'm wrapping up a couple critical projects and selling off pretty much everything else.
I did post a number of sample videos in a thread about the JB/59 not too long ago...most were of ESP Exhibition guitars that used this combo. The impression I got from the vids was that the JB/59 hybrid is fairly open sounding with a bit of attitude thrown in. Made me think of a hotter Pearly Gates type tone in a way.